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Retrobrite cleaning on old cellulose acetate bricks?

Is Retrobrite (cleaning with hydrogen peroxide, oxyclean, sunlight) effective or ineffective or, worse, downright destructive on old cellulose acetate bricks? My understanding is that method of ...
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vote
1answer
153 views

How to differentiate Cellulose acetate vs ABS lego bricks?

If one had a large tub of old legos, with some pieces going back to the 1950s, but all mixed together, are there any distinguishing features or appearance to the 1950s cellulose acetate bricks ...